Hydrangea is a perennial grown for its blue blooms, which open in indeterminate and return year after year. It's hardy across USDA zones 6 through 9 and grows just as well in a container as in the ground. Its indeterminate flowers are a moderate draw for honeybees and native bees.
Hydrangea — the short answer
Hydrangea: grown in zones 6–9, part sun, pH 5–7.
- USDA zones
- 6–9
- Hardy to zone 6a — NC State Extension Gardener Plant Toolbox; USDA PLANTS Database (-13 °F, converted).
- Soil pH
- 5–7
- Growable Ground Plant Database
- Sun
- Part Sun
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Hydrangea on your exact land.
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What Hydrangea is
Hydrangea grows as a perennial and reaches around four feet at maturity. It blooms blue in indeterminate. It's also well suited to containers.
How to grow Hydrangea
Hydrangea grows in USDA zones 6 through 9. Hydrangea does best in part sun — at least 4 hours of direct sun a day — and soil from pH 5 to 7, on well-drained ground.
USDA Zones
6-9
Rated hardy to zone 6a by NC State Extension Gardener Plant Toolbox; USDA PLANTS Database lists -13 °F, converted to zone 6a, checked Oct 2026. Ceiling: not verified.
Soil pH
5 - 7
Growable Ground Plant Database
Sun
Part Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Mature Height
4 ft
Growable Ground plant catalog
Start the season right
Plant hydrangea in part sun with at least 4 hours of direct sun. It grows in the cool halves of the year, so sow it in spring or late summer rather than waiting for midsummer heat.
Match the soil
Hydrangea prefers pH 5 to 7 (Growable Ground Plant Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut hydrangea blooms in the cool of the morning, just as they open, for the longest display.
Where Hydrangea thrives
Hydrangea is hardy across USDA zones 6 through 9. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 6–9 spans average winter lows from -10°F to 30°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 14 outright and splits 34 more down the middle — and which side of that line your land sits on changes the answer.
Zones 6–9·Where Hydrangea growsOpen map →
This map is derived from the USDA ARS / PRISM Plant Hardiness Zone Map (2023) and is not the official USDA Plant Hardiness Zone Map.
Where Hydrangea stands, state by state
Hydrangea is rated for zones 6–9 — a cold floor USDA puts at -10 to 0°F. Across the 50 states and DC, 14 sit fully inside that band, the line runs through 34 more, and 3 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 6–9
14 states
- Arkansas · zones 6b-8b
- Connecticut · zones 6a-7b
- Kentucky · zones 6a-7b
3 of 14 shown
The line runs through
34 states
3 of 34 shown
Hydrangea’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.
Outside zones 6–9
3 states
- Minnesota · zones 3a-5a
- North Dakota · zones 3b-4b
- South Dakota · zones 4a-5b
Winter cold is the limit here — the same plant often works in a container that comes under cover. Each link is that state’s own growing hub.
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Hydrangea
Growing guides for hydrangea
Good to know
One caution for pet owners — hydrangea is toxic to dogs, cats and horses (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Hydrangea offers moderate value to bees and other pollinators. (Source: Pollinator Partnership.)
Your land is one point inside Hydrangea's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Hydrangea will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether hydrangea actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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How we know this about Hydrangea
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database•ASPCA
Frequently asked questions
Can I grow Hydrangea in my zone?
Hydrangea grows in USDA hardiness zones 6 through 9 (Rated hardy to zone 6a by NC State Extension Gardener Plant Toolbox; USDA PLANTS Database lists -13 °F, converted to zone 6a, checked Oct 2026. Ceiling: not verified.). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Hydrangea?
Hydrangea is a cool-season crop, so it goes in during the cool halves of the year — early spring, and again in late summer for a fall planting — rather than at the height of summer heat. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Hydrangea need?
Hydrangea does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.
What soil does Hydrangea need?
Hydrangea prefers soil pH 5 to 7, on well-drained ground (Growable Ground Plant Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Hydrangea attract pollinators?
Yes — hydrangea's flowers are a solid nectar source for honeybees and native bees. (Source: Pollinator Partnership.)
Is Hydrangea safe for pets?
Hydrangea is toxic to dogs, cats and horses with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Keep exploring Hydrangea
Hydrangea state by state
Every state hydrangea's zone reaches — 1 link straight to that state's hydrangea growing page; the rest open the state's full growing guide.